A second-half stunner from Youri Tielemans saw The Foxes run out 1-0 winners at Wembley and seal their first ever FA Cup.
Players celebrated wildly following the game and one video saw Amartey approach the camera holding the pennant, which are exchanged at kick-off.
The 26-year-old then decided to throw it over his shoulder as it landed in a crumpled mess on the ground.
The disrespect from Daniel Amartey
(via lawestt_/IG) pic.twitter.com/yfuxkOmFri
- ESPN FC (@ESPNFC) May 15, 2021
Amartey was on the bench on Saturday evening and didn't manage to get on the pitch, with manager Brendan Rodgers only making four substitutions.
Chelsea welcome Leicester to Stamford Bridge in the Premier League on Tuesday and tensions promise to be high.
Fans have reacted to Amartey's actions and they're hoping it gives Blues players motivation to get the league victory next week.
It won't make up for this loss but Chelsea need to batter Leicester on Tuesday.- Alex Goldberg (@AlexGoldberg_) May 15, 2021
A. They need to show us some pride
B. What Daniel Amartey did with our flag in the Leicester dressing room was beyond disrespectful & needless
Daniel Amartey might never play for Chelsea in his life for what he did. It's gross disrespect to Chelsea and he should apologize for that tbh- KELEWELE JOINT :fries: (@ANKAMAGYIMI__) May 15, 2021
What he did is very very wrong
If these Chelsea players watch this Daniel Amartey video and don't turn up on Tuesday, then there's something wrong :skull:pic.twitter.com/lrZ8gk9q2e- Kωαme Benαιαh:goat: (@kwamebenaiah) May 15, 2021
Amartey doing this means he's lost most of Chelsea fans cos ♂️♂️♂️ pic.twitter.com/HAOGwIZKyi- The thinker man (@kwekuedilson) May 15, 2021
It wasn't just Leicester players who caused a stir on social media however, with Chelsea striker Tammy Abraham hitting the headlines.
Manager Thomas Tuchel opted to leave the forward out of his squad entirely and it's something Leah Monroe, Abraham's partner, was furious with.
"How on earth do you make the decision to leave your top goal scorer out of the squad for a final?" posted Monroe on her Instagram, before later deleting her message.
"The same person who even scored the goals to actually qualify for this competition? It's not making any sense whatsoever."
She finished: "Not even the bench?! This has to be a joke."
Abraham has four goals in three FA Cup matches this season, but has seen his game time reduced since Tuchel replaced Frank Lampard in late January.
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